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You can script it. Look at the script steps under the "Accounts" section:
However, it's dangerous to just have this as someone with a guessed username would be able to gain access.
Therefore, I use a table-based user management system that stores a PIN number and email address, or other points of identifying information. In my password reset scripts I require these things to be authenticated before a temporary password is generated and reset on the account. Then the user is required to select a new password when logging in.
A good place to start is Darren Burgess's Accounts Module:
That will get you the table-based user management system setup, as well as an admin layout so you can manage users in filemaker rather than through File > Manage > Security.
From there you're on your own for adding a password reset script, but it's not too difficult to do.